5
Inspection
Inspection of the fan should be conducted in the first
30 minutes
,
8 hour
and
24 hour
intervals of satisfactory
operation. Inspect bolts, setscrews, and motor mounting bolts. Adjust and tighten as necessary. Also check for
unusual or excessive noise and vibration.
Maintenance
M.K. Plastics AXPR
fans are manufactured to high standards with quality materials and components. Proper
maintenance will ensure a long and trouble-free service life.
Do not attempt any maintenance on a fan unless the electrical
supply has been completely disconnected and
locked.
In many cases, a fan can windmill despite removal of all electrical power. The rotating assembly should be
blocked securely before attempting maintenance of any kind. The key to
good fan maintenance is regular and
systematic inspection of all fan parts. Inspection frequency is determined by the severity of the application and local
conditions. Strict adherence to an inspection schedule is essential.
Establish a schedule for inspecting all parts of the fan. Inspect fans exhausting corrosive or contaminated air within
the first month of operation. Fans exhausting contaminated air (airborne particles) should be inspected every three
months, or sooner. Regular inspections are recommended for fans exhausting non-contaminated air.
It is recommended the following inspection be conducted twice per year.
•
Inspect bolts and setscrews for tightness. Tighten as necessary. Worn setscrews should be replaced
immediately.
•
Inspect for cleanliness. Clean exterior surfaces only. Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the propeller and housing prevents imbalance and damage.
Propeller Balance
Airstreams containing particulate or chemicals can cause abrasion or corrosion of fan parts. This wear is often
uneven and can lead to significant propeller imbalance over time. When such wear is discovered, a decision must be
made to rebalance or replace the propeller. Specialized equipment can be used to rebalance a cleaned propeller that
is considered structurally sound. Balance weights should be rigidly attached at a point that will not interfere with other
fan components nor disrupt airflow.
Motor Bearings
Fractional horsepower motors installed on the smaller fans are generally lubricated for life and require no further
attention. Motors equipped with oil holes should be oiled in accordance with the manufacturer's instructions printed on
the motor. Use a high grade SAE 20 machine oil and use caution not to over lubricate. Motors supplied with grease
fittings should be greased according to directions printed on the motor. It is advisable to have your maintenance
department remove and disassemble the motor, and lubricate the bearings after 3 years of operation in excessive
heat and or in a contaminated air stream consisting of airborne particles.
Motor Service
Should the motor prove defective within one-year period, contact
M.K. Plastics
directly, or your nearest motor service
representative.
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•
Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or
drive belt assembly.
•
Poor fan inlet conditions. There should be no obstructions at the inlet.
•
Improper
wheel
alignment.
Excessive Vibration and Noise
•
Damaged or unbalanced propeller.
•
Speed too high.
•
Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor.
•
Motor bearings need lubrication or motor may need replacement.
•
Fan
surge.
Overheated Motor
•
Motor
improperly
wired.
•
Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor.
•
Cooling air diverted or blocked.
•
Improper
inlet
clearance.
•
Incorrect fan RPM.
•
Incorrect
voltage.
